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Influence of ventilation ratio on the efficiency of a desiccant air conditioning system.

[In Japanese. / En japonais.]

Author(s) : TRAN T. N., HAMAMOTO Y., AKISAWA A., et al.

Type of article: Article

Summary

The study investigates the energy efficiency performance of a desiccant dehumidification air-conditioning system in the context of ventilation for a hot-humid climate such as summer in Japan. The investigation focuses on the variable ratio of ventilation air as required by the application of air conditioning system. The COP of the desiccant air conditioning system is determined. The evaluation is subsequently performed by comparing the desiccant based system with the conventional absorption cooling system and the vapour compression cooling system. Based on 12 desiccant rotor simulations, it is found that the desiccant regeneration temperature required varies between 47 to 85 °C as ventilation ratio increases from 0.0 to 100%, and up to 52.5 °C as the ventilation ratio achieves 14%. The heat required for regenerating desiccant accounts for 55% and higher of the system's total heat consumption; the system is expected to be energy efficient by using wasted heat from the absorption chiller for desiccant regeneration; and its energy efficiency expands as the ratio of ventilation air rises above 15% compared with the conventional absorption cooling system. The energy efficiency also benefits as the ratio rises beyond 70% against the conventional vapour compression cooling system.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2005-0336
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 21 - n. 1
  • Publication date: 2004

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